Process of producing a perforated thermoplastic sheet
United States Patent 3054148

Inventors:
Frederick, Zimmerli William
Publication Date:
09/18/1962
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Assignee:
Frederick, Zimmerli William
Primary Class:
Other Classes:
425/DIG.037, 264/154
International Classes:
B26F1/26; B44F11/00; B26F1/00
US Patent References:
2032935Rubber film or sheet
2055002Process of producing foraminous coated material
2161308Manufacture of goods of spongelike or cellular rubber
2219578Manufacture of medicinal capsules
2354916Method and apparatus for embossing plastic sheet material
2446771Method of imparting surface effects to thermoplastic sheets
2493439
2518565Apparatus for simultaneously producing multiple recesses in plastic sheet material
2567275Apparatus and method of goffering thermoplastic materials
2660757Method and apparatus for producing textured films